A site consists of a homogeneous dense silty sand layer of 9 m thickness, which is underlain by an impervious stiff clay stratum. The initial water table was at 4 m depth below the ground level. A pumping test was carried out by pumping out water at the rate of 0.7 m°/min. Observation wells were dug into the ground at 15 m and 50 m distances from the center line of the well. At steady state (i.e., when there was no change in water levels in the observation wells), the water levels in the two wells dropped by 600 mm and 100 mm, respectively. Determine the hydraulic conductivity of the clayey sand layer.

A site consists of a homogeneous dense silty sand layer of 9 m thickness, which is underlain by an impervious stiff clay stratum. The initial water table was at 4 m depth below the ground level. A pumping test was carried out by pumping out water at the rate of 0.7 m°/min. Observation wells were dug into the ground at 15 m and 50 m distances from the center line of the well. At steady state (i.e., when there was no change in water levels in the observation wells), the water levels in the two wells dropped by 600 mm and 100 mm, respectively. Determine the hydraulic conductivity of the clayey sand layer.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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A permeability pumping test was carried out in a confined aquifer with the piezometric level before pumping is 2.17 m. below the ground surface. The aquiclude (impermeable layer) has a thickness of 5.59 m. measured from the ground surface and the confined aquifer is 7.6 m. deep until it reaches the aquiclude (impermeable layer) at the bottom. At a steady pumping rate of 15.1 m³/hour the drawdown in the observation wells. were respectively equal to 1.65 m. and 0.47 m. The distances of the observation wells from the center of the test well were 16 m. and 30 m. respectively. Compute the depth of water at the farthest observation well. Compute the transmissibility of the impermeable layer in cm²/sec.
Please answer with complete solution and Fbd. A field sample of an unconfined aquifer is packed in a test cylinder. The length and diameter of the cylinder are 60cm and 8cm, respectively. The field sample is tested for a period of 2min under a constant head difference of 18.5 cm. As a result, 50cm3 of water is collected at the outlet. Determine the hydraulic conductivity of the aquifer sample.
Assume a chemical solvent, which is denser than water is spilled into the reservoir. How many days will it take for the contaminant to reach the observation well assuming only advection occurs in the aquifer? The stratum has a hydraulic conductivity of 4 x 10-² cm/sec The silty sand in the aquifer has a void ratio of 0.75. Observation well↓ el. 167.3 m Reservoir Clay Silty sand Clay 256 m el. 165.0 m 3.2 m
The discharge from a fully penetrating well operating under steady state in a confinedaquifer of 35 m thickness is 2000 lpm. Values of drawdown at two observation wells 12 and 120 m away from the well are 3.0 and 0.30 m respectively. Determine the permeability of the aquifer.
A sand deposit of 12 m thick overlies a clay layer. The water table is 3 m below the ground surface. In a field permeability pump-out test, the water is pumped out at a rate of 540 litres per minute when steady state conditions are reached. Two observation wells are located at 18 m and 36 m from the centre of the test well. The depths of the drawdown curve are 1.8 m and 1.5 m respectively for these two wells. Determine the coefficient of permeability. a. 625 X 10^-2 b. 2.15 x 10^-2 c. 4.5 x 10^-1 d. 1.6 X 10^-1
Q-26: A 0.5 m diameter well fully penetrates an unconfined aquifer whose bottom is 150 m below the undisturbed groundwater table. The water is pumped out from the well at a constant rate of 0.1 m³/s. After equilibrium is reached, the drawdown observed in two observation wells at radial distances of 10 m and 50m are respectively 10 m and 5 m. Determine (i) The coefficient of permeability (in m/s) (ii) The drawdown in the well (in m)
1. A sand sample of 35 cm² cross sectional area and 20 cm long was tested in a constant head permeameter. Under a head of 60 cm, the discharge was 120 mL in 6 min. The dry weight of sand used for the test was 1120 g, and G₁ = 2.68. Determine (a) the hydraulic conductivity in cm/sec, (b) the discharge velocity, and (c) the seepage velocity.
A well was constructed to pump water from a confined aquifer. Two observation wells were constructed at distances of 350 m and 800m respectively. At a steady pumping rate of 0.39 m^3/min, the drawdown in the observation wells were respectively equal to 1.6 m and 7.8 m. Diameter of the test well is 0.95 m and thickness of confined aquifer is 16 m. a. Determine the hydraulic conductivity of the soil in m/min. (IN EXPONENTIAL FORM AND IN 2 DECIMAL PLACES) b. Determine the drawdown at the test well in m. (IN 2 DECIMAL PLACES) c. What is the value of the transmissivity of the confined aquifer in m^2/day? (IN 2 DECIMAL PLACES)
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